Packing bag



FIG. 1 is a front view of the packing bag showing my new design;

FIG. 2 is a rear view thereof,

FIG. 3 is a right side view thereof,

FIG. 4 is a left side view thereof,

FIG. 5 is a top plan view thereof,

FIG. 6 is a bottom view thereof, and,

FIG. 7 is a front perspective view thereof. 

The ornamental design for a packing bag, as shown and described. 